浅海粗糙海面影响下的声场水平纵向相关性

Effects of rough sea surface on acoustic longitudinal horizontal correlation in shallow water

浅海粗糙海面会引起海面反射损失和声场能量的重新分布,对接收阵的阵增益有着重要影响。本文考虑浅海粗糙海面的因素,结合小斜率近似散射理论和简正波声场模型,分析了不同海面风速下的声场水平纵向相关性。在给定的条件下,随着风速的增加,声场水平纵向相关性提高。通过简正波理论和简正波声场模型给出了解释:随着风速的增加,高号简正波衰减较快,声场中的有效简正波号数减少,导致声场中的简正波干涉减弱,从而提高了声场水平纵向相关性。

Rough sea surface can lead to surface reflection loss and redistribution of the acoustic energy,which significantly influence the array gain of the receiving array.Considering the effect of wind-generated rough surface in shallow waters,by combining the small slope approximation scattering theory and the normal mode acoustic model,the acoustic longitudinal horizontal correlation considering different wind speeds on the sea is analyzed.In the given condition,with the increase in wind speed,the acoustic longitudinal horizontal correlation intensifies.The normal mode theory and the normal mode acoustic model are used to give the reason:with the wind speed increasing,the normal modes with higher orders decline sharply,which leads to fewer effective normal modes.As a result,the interference between the normal modes is weakened to increase the acoustic longitudinal horizontal correlation.